Write the reaction equation: Pentane → isopentane → isoprene → rubber

1. Reaction of pentane isomerization, catalyst Al2O3, t = 100 ° C. CH3-CH2-CH2-CH2-CH3 = (CH3) 2-CH-CH2-CH3. 2. Dehydrogenation reaction in the presence of Сr2O3 catalyst: (CH3) 2-CH-CH2-CH3 => CH2 = C (CH3) -CH2 = CH2 + 2H2. 3. Obtaining cis-polymer isoprene (rubber) by the Lebedev reaction in the presence of metallic sodium under pressure: CH2 = C (CH3) -CH2 = CH2 + CH2 = C (CH3) -CH2 = CH2 + …. = (-CH2 -C (CH3) = CH-CH2-) n.